I noticed something while looking at the timed rankings: My top three times for each size are all relatively similar in their range, despite the times being shorter (for 4x4s) or longer (6x6s). Here's what I found with my own times.

Findings:- I am far more consistent with 5x5 and 6x6 puzzles than 4x4s, shown by the 30% increase from my best 4x4 time to my third best.- I am very consistent through my top 3 in 5x5 puzzles, differing by less than 1/3 second from 1 to 3.- The best time overall seems to be a surprise, resulting in a larger gap between 1st and 2nd in all cases.